Local Govt | National News Video | Parliament Headlines | Politics Headlines | Search

 


Recovery of native fish in Zealandia

Recovery of native fish in Zealandia

February 28, 2013

Another step on the way to restoring Wellington’s Zealandia, as closely as possible, to its pre-human state has been achieved with the eradication of introduced fish from its upper waterways.

“We’ve had great success in controlling pest mammals but this operation to restore our freshwater ecosystem had been on our wish-list for many years so we’re delighted with the results” says Zealandia’s Conservation Manager, Raewyn Empson.

The operation, begun in 2011 in collaboration with DOC, was designed to see if using a naturally-occurring chemical, called rotenone, in flowing water would completely remove introduced trout and improve native freshwater fauna populations.

“A spectacular recovery of native freshwater fauna and continued absence of trout is strong evidence that trout have been eradicated from the upper Karori reservoir and streams” says David Moss from the Department of Conservation (DOC).

“Before the operation there were a few big banded native kōkopu, very few whitebait and hundreds of trout in the streams,” said Mr Moss. Results from fish sampling since the operation in February 2011 confirm trout have been eradicated, and show a dramatic increase in the number of whitebait and now juvenile banded kōkopu and kōura (freshwater crayfish).

With the confirmed absence of trout, Zealandia can now plan to introduce other native fish species into the safer reservoir and streams.

“This breakthrough means we can now start planning to enhance the recovery of the upper reservoir and its tributaries by transfers of other native fish - such as the threatened giant kōkopu” says Empson.

Further information:

-The fish toxin rotenone has been used in New Zealand for a number of years to remove pest fish from lakes and ponds. Eradication of introduced fish from streams is a “first” for New Zealand.

- Brown trout were introduced into New Zealand in 1867 as a sports fish. They compete with adult banded kōkopu and eat the juvenile stage whitebait, as well as invertebrates like kōura.

ENDS

© Scoop Media

 
 
 
 
 
Parliament Headlines | Politics Headlines | Regional Headlines

Gordon Campbell:
On The Team Behind Trump's Throne

Forget the Putin factor. Daily, the team of charlatans, bigots and stunningly ignorant crackpots that Trump is appointing to head key federal agencies is just as alarming. These are positions with vast power and budgetary discretion over policies that stand to affect tens of millions of vulnerable Americans. Sad! More>>

 

Gordon Campbell: On Bill English, Abroad

If David Cameron was the closest thing John Key had to a political mentor, their successors also share a whole lot in common. Theresa May and Bill English were both propelled into the top jobs as the result of unexpected resignations, and without much in the way of credible competition from their colleagues... More>>

ALSO:

Pike River: Labour Bill To Override Safety Act For Mine Entry

“Bill English has been hiding behind the legal excuse that any attempt to re-enter the mine to recover the bodies might place the mine’s owner, Solid Energy Limited, and its directors in breach of the Health and Safety at Work Act 2015." More>>

ALSO:

Gordon Campbell: On Populism And Labour 2017

For many people on the centre-left, populism is a dirty word, and a shorthand for the politics of bigotry. In this country, it has tended to be equated with the angry legions of New Zealand First. Who knew they were not just a reactionary spasm, but the wave of the future? More>>

Oxfam: 30% Of NZ Owns Less Wealth Than Our Two Richest Men

The research also reveals that the richest one per cent have 20 per cent of the wealth in New Zealand, while 90 per cent of the population owns less than half of the nation’s wealth. The research forms part of a global report released to coincide with this week’s annual meeting of political and business leaders at the World Economic Forum in Davos, Switzerland. More>>

ALSO:

Hospitals: Resident Doctors Set To Strike Again

Despite discussions between the DHBs and NZRDA over safer hours for resident doctors progressing during the last week, the strike planned for next week appears set to proceed. More>>

ALSO:

Not So Super Fund: More Burning Ethical Questions For Steven Joyce

Greens: Radio New Zealand reported this morning that the New Zealand Superfund has $77 million invested in 47 coal companies that the Norwegian Government’s Pension Fund – the largest sovereign fund in the world – has blacklisted. More>>

Activism: Greenpeace Intercepts World’s Biggest Seismic Oil Ship

Greenpeace crew have made contact with the world’s biggest seismic oil ship after travelling 50 nautical miles on two rigid-hulled inflatables off the coast of Wairarapa... Greenpeace radioed the master of the Amazon Warrior to deliver an open letter of protest signed by over 60,000 New Zealanders. More>>

ALSO:

Gordon Campbell: Why Tax Cuts In 2017 Would Be A (Proven) Bad Idea

Ever since the world fell prey to the mullahs of the free market in the 1980s, no amount of real world evidence has managed dispel one key tenet of their economic faith. Namely, the idea that if you cut income taxes and taxes on small business, a wave of individual enterprise and entrepreneurial energy will thus be unleashed, profits will rise and – hey bingo! – the tax cuts will soon be paying for themselves ... More>>

Get More From Scoop

 

LATEST HEADLINES

 
 
 
 
 
More RSS  RSS
 
 
 
Regional
Search Scoop  
 
 
Powered by Vodafone
NZ independent news